Pneumatic hammer.



110.8735936. PATENTED Nov. 1a, 1906.

- c. T. GARNAHAN & J. MURPHY.

PNBUMATIG HAMMER.

AP'PLIUATION FILED JUNI] 28. 1906.

ljy amg UNITED STATES PATENT OEEIOE.

OHARLEST. cARNAHAN AND JEREMIAH MURPHY, OF DENVER, COLORADO; SAID MURPHYASSIGNOR To sAiD OARNAHAN.

PNEUMATIC HAMMER.

Specification of Letters `Patent.

Application iiled June 28, 1906. Serial No` 323,944.

` United States, residing at Denver, in the county of Denver and Stateof Colorado, have invented new and useful Im rovements in PneumaticHammers, of whic the following is a specification.

This invention relates to pneumatic hammers, and alms to provide means,as hereinafter set forth, to enable an operator to turn e the cylinderof the hammer by one hand in a convenient manner; to prevent the Hoppingaround of the air-hose, thereby preventing the tangling and wearingthereof; to increase the durability of the air-hose at its point ofconnection between one endthereof and the air-inlet nipple, and toconstitute a manuallyoperated throttle-valve positioned in such a mannerthat the operator can readily open and close the valve when occasionrequlres without going to the necessity of removing that hand which isused to turn the cylinder of the hammer.

In pneumatic hammers now in general use the operator turns the cylinderwith his right hand by grasping the air-hose n ear its connection withthe cylinder; This operation is open to theobjection that the air-hoseflops around when the cylinder is turned, which, 1n

some instances, causes the tangling of the airhose but in all'cases whenthe cylinder is turned in the manner as stated it causes the fair-'hoseto wear out quickly at the point of connection thereof with thecylinder. 4In addition to the foregoing it is necessary to use on theair-hose a common air-cock, which does not work very well, for thereason that the vibration of the hammer has a tendencyto close theair-cock, and the operator is therefore compelled to retain his hand onit constantly to keep it open or else to constantly open the cock. Inother forms of pneumatic hammers the air connections are positioned atthe handle end of the cylinder, and the air is conveyed by suitablepassages to the interior of the cylinder. For turning the cylinder ofsuch form of pneumatic hammers av clamp or pin is attached to thecylinder, which is grasped by the operator. This has also i `been foundobjectionable, as the air-hose will be caused to flop around, and,furthermore,

there is considerable wear at the point of connection between the hoseand the device.

The foregoing objections are all fully overcome by setting up apneumatic hammer in accordance with this invention.

The invention further aims to provide a pneumatic hammer with means forthe purpose set forth which shall be simple in its construction andarrangement;` strong, durable,

eilicient in its use, imparting longevity to the air-hose; readilyset upin connection withthe Patented Nov. 13, 19'06.

hammer, and comparatively inexpensive to manufacture. With the foregoingand other objects in view the invention consists of. the novelconstruction, combination, and arrangement of responding partsthroughout both views, and

in which-q Figure 1 is aside elevation of a pneumatic hammer inaccordance with our invention, the

cylinder of the hammer being artly broken roken away. a

away, and the air-hose also Fig. 2 isa longitudinal sectional view of athrottle-valve casing provided with an air-inlet nipple, said casingconstituting a permanently-fixed handle for the operator to turn thecylinder of thehammer.

Referring to the drawings by referencey characters, 1 denotes thecylinder of the hammer, which has a portion of the wall A thereofreinforced, as at 2, and the said reinforced portion 2 has extendingentirely therethrough an opening with the wall 3 thereof screw-threaded.At one end of the cylinder l a'cap 4 is secured,and to the cap 4 isswivelly connected, as at 5, a handle 6. To lock the handle 6 to the cap4, a latch is provided, consisting `of a pair of ears 7 carried by thehandle, a pair of ears 8, carried by the cap and in alinement with theears 7, and a spring-arm 9, fixed at one end tothe cap 4 IOO and adapted'to extend between the ears of from rotating independently of thehandle. When the arm 9 is removed Vfrom between the ears 7 of the handle6, it will be evident that the cylinder 1 can be rotated independent ofthe handle.

The reference character 10 denotes a throttle-valve casing positioned soas to extend at right angles with respect to the cyl- Saidscrew-threaded portion 11 is adapted to extend in the opening formed inthe reinforced portion 2 of the cylinder 1 and engage the screw-threadsof the wall 3 of said openf occasion so requires.

ing, and by such arrangement it is evident that said casing is securedto the cylinder 1 and extends at right angles with respect thereto. Thecasing 10 in proximity to the reduced portion 11 is shouldered, therebyforming a valve-seat 12, upon which is adapted to be seated the taperedend 13 of the throttle-valve 14. The latter is positioned in thecasing10, is somewhat elongated and of a diameter to movably fit the innerface of the casing 10, but the fit is such that' the valve 14 can bereciprocated when When the end 13 of the valve 14 is against the seat12, the passage 15 through the reduced portion 11 is closed. The innerlend of the casing 10 has formed integral therewith a cylindricalairinlet nipple 16, which extends at right angles with respect to thecasing 10, is formed with an air-supply passage 17, which opens into thecasing 10 at a point. slightly removed from theseat 12 and has theair-hose 16-a connected thereto. The passage 17 is closed by the side ofthelvalve 14, owing to the fact, ase-before stated, that the valve 14 issome- Whatelongated. The position of the p assage 17 with respect. tothe valve-seat` 12 is such thatsaid passage can be closed before thevalve 14 engages the seat 12. The valve 14 is provided with an elongatedstem 18, which isof suchlength as to project from the outer endet-.thecasing 10. The inner face of the casing 10 near'its outerend isshouldered, as at19', and screw-threaded, as a-t 20. Upon the' shoulder19 is mounted a gasket 21, which constitutesl a stop for limiting theoutward movement of the valve 14. Upon the gasket 21 a packing 22 isarranged, and bearing against the packing 22is a screw-threaded gland23, which projects from the outer end ot the casing 10 and is headed, asat 24. Through the gasket 21, packing 22, gland 23, andphead 24, thevalve-stem 18 extends, and the said stem -projects above the head 24'01"the gland 23. The outer end of the stem 18 is screw-threaded, and to thesaid, screwthreaded end a stop-nut 25 is secured, which also constitutesa handle-piece for the stem, so that the stem can be readily grasped bythe operator to shift the valve to and from its seat. The gasket 21 alsoacts as a means to indicate to the operator that the valve 14 Vhas beenwithdrawn the necessary distance to open the passage 17 through theinletnipple 16. v

Owing to themanner of setting up the casing 10 it is evidentthat itconstitutes a fixed handle for rotating the cylinder independent of thehandle 6, and when the operator desires to open the valve he simplypushes out with the hand thatv grasps the casing 10, and when he desiresto close the valve the operator pushes his hand in. Consequently theoperator does not have to remove that hand which he is using to turn thecylindery when it is desired to open and close the valve. The air-hosebeing close to the cylinder and extending in the direction in which thecylinder extends, the hose has a very little movement, as will beevident. As the -hose is connected up to the inletnipple extending atright angles With respect tov the valve-casing, it is evident thatr thehose does. not have to be grasped when turning the cylinder as theturning movement is had by grasping the casing 10. By such operation itis evident that the point of connection between the hose and air-inletnipple will not wear out. as quickly as it would if the nipple wasdirectly conn'ected kto the cylinder and the hose extended at rightangles with respect to thecylinderas is the case with pneumatic hammersnow in general use.

The valve 14 when open. will remain insuch position owing tothe-airressure against the Working-face of the4 va ve,. and when the'Valve is closed it will be held in such position owing to the pressureof the air on the shoulder 14a. The valve 14 dees` notv fit tightlyagainst the inner face of the casing 10, which permits enough-air toleak back between the valve and the casing-so that sufficient pressurewill be exerted against the shoulder 14a. This pressure retains thevalve in its closed Osition.

Having thus ful y described our-invention, what we claim as new, anddesire to vsecure by Letters Patent, is

1. A pneumatic hammer comprising a throttle-valve mechanism positionedat right angles with respect to the cylinder of the hammer, saidmechanism having as a part thereof, an air-inlet nipple extending atright angles with respect thereto.

2. A pneumatic hammer comprising. a throttle-valve casing secured to thecylinder thereof and extending at right. angles with respect thereto,said casing provided with. an air-inlet nipple extending at right angleswith IOO IIO

` respect thereto and .further provided With a throttle-valve seat, areciprocatory throttlevalve mounted in said casing and adapted to closethe inner end of the casing and the inletnipple, and a valve-stemconnected With the va ve and projecting out of the casing.

. 3. A pneumatic hammer comprising a rotatable cylinder provided With areinforcement, a valve-casing connected to said reinforcement andprovided with a valve-seat I and further provided With an air-inletnipple extending at right angles with respect to said casing and adaptedto have an air-hose con-r and further provided With an air-inlet nippleextending at right angles With respect to said casing and adapted tohave an air-hose 'connected thereto, a reciprocatory valve o erating insaid casing and adapted to close t e inner end thereof and thesaidair-inlet nipple, a stem projecting from said valve and .of such lengthas to extend from the outer end ofthe casing, and means Within saidcasing for limiting-the outward movement of the valve.

5. A pneumatic hammer comprising a rotatable cylinder, and athrottle-valve mechanism secured to the side of the cylinder andextending at right angles With respect to the cylinder and provided withan air-inlet nipple adapted to have an air-hose lconnected thereto, saidthrottle-valve mechanism constituting a handle for turning the cylinder.

6. A pneumatic hammer comprising a rotatable cylinder, and athrottle-valve mechanism secured tothe sides of the cylinder andextending at right angles with respect to the cylinder and provided withan air-inlet nipple adapted to have thev air-hose connected thereto,said throttle-valve mechanism constituting a handle for turning thecylinder and embodying means for limiting the outward movement of thevalve thereof.

7. A pneumatic hammer comprising a rotatable cylinder provided With areinforcement, and a valve mechanism connected to y said reinforcementand extending at right angles With respect to the cylinder, said valve`mechanism constituting a means for re ulating the air-supply ,to thecylinder an a handle for turning the cylinder.

8. A pneumatic hammer comprising a rotatable cylinder provided With areinforcement, and a valve mechanism connected to said reinforcement andextending at right angles with respect to the cylinder, said valvemechanism constituting a means for regulating the air-supply to thecylinder and a handle for turning the cylinder, said throttle-valvemechanism provided With means extending at right angles With respectthereto for connecting the air-supply means thereto.

9. A pneumatic hammer comprising a throttle-valve mechanism positionedat right angles With respect to the cylinder of the hammer, saidmechanism having as a part thereof, an air-inlet nipple extending atright angles With respect thereto and means for limiting the movement inone direction of the valve thereof.

10. A pneumatic hammer comprising a valve mechanism extending at rightangles with respect to the cylinder thereof and constituting a handlefor turning the cylinder -independent of the handle of the hammer andfurther constituting means for opening and closing a motive-fluidsupply.

l1. A pneumatic` hammer comprising a manually-operated reciprocatoryvalve mechanism for opening and closing a motivefluid supply, saidmechanism connected to and projecting at right angles from the cylinderof the hammer and further constituting a handle for turning the hammer.

12. A pneumatic hammer comprising a manually-operated reciprocatoryvalve mechanism for opening and closing a motivefluid supply, saidmechanism connected to and projecting at right angles from the cylinderof the hammer and further constituting a handle for turning the hammer,and a motive-fluid supply connected to said mechanism and extending atright angles with respect thereto. j,

'13. A pneumatic hammerl comprising a cylinder, a handle sWivellyconnected to one end thereof, and a valve mechanismconnected to saidcylinder and extending at an angle With respect thereto, said mechanismconstituting a handle for turning the cylinder independently of thehandle sWivelly connected to the cylinder.

14;. A pneumatic hammer` comprising a cylinder, a handle sWivellyconnected to vone IOO IIO

end thereof, ay valve mechanism connected to said cylinder and extendingat an angle with respect thereto, said mechanism constituting a handlefor turning the cylinder independently of the handle sWivelly connectedto the cylinder, and an air-supply means connected .to said mechanismand extending at an angle With respect thereto.

15. A pneumatic hammer comprising a cylinder, a valve-casin connected tothe side thereof and extending at an angle with respect thereto, saidcasing provided at its inner end with an outlet o ening into theinterior of the cylinder an With an inlet in the side thereofcommunicating With a source of motive-fluid su ply, and a reciprocatoryvalve mounted in the said casing and adapted When Vmoved in onedirection to close said inlet and outlet and When moved in the oppositedirection to open said inlet'andoutlet. 16. A pneumatic Vhammercomprising a cylinder, a valve-'casing -connected to `the side thereofand extending at Aan angle With respect thereto, said casing -providedat its inner end with an outlet opening into the interior of thecylinder and With an inlet -inthe side thereoffcommunicating with asource of motive-Huid supply, la reciprocatory valve mounted in the`said casi-ng and adapted When `moved in one Adirection `to close saidinlet and outlet and when moved in thelopposite direction to open saidinlet and outlet, and means Within rthe casing `for limiting ytheopening movement of the valve.

11,7. A vpneumatic hammer comprising a valve lmechanism extending atright angles. with respect =to the cylinder thereof-and constituting ahandle for turning the cylinder independently of the handle of thehammer and further-constituting a means VJfor opening a handle forturning Ithe hammer, said mechanism having the valve thereofautomatically retained in Open position by pressure and provided With apressure bearing-surface for retaining 4the valve in closed position.

In testimony whereof We have hereunto set our hands in presence of twosubscribing Witnesses.

CHARLES T. CARNAHAN. J-EREMIAH MURPHY. Witnesses:

H. J. PHILLIPS, LATIMER FoPLEss.

